I watched the UW Photography Show video an hour after it was posted, and it was in my cart before the video ended. Rechargeable manual flash trigger that uses lasers to fire the strobes. 200k flashes per battery charge over USB-C and it costs 120 UKP. He also makes beam restrictors and a bunch of other toys. I think Alex said something about gel fiber optic cables? 

The only downside is I only saw this a week before leaving for Anilao so it will have to wait for the next trip. 

https://www.youtube.com/watch?v=uLDO6saYuXU

https://underwaterlightandmagic.co.uk/

Strangely no Nikon / Nauticam model. I didn't even know Aquatica was still in business and there are models for that.

Perhaps its because Nauticam includes a simple manual flash trigger in their Nikon housings with a similar infinite battery life.

I'm sure it's coming, I think these are custom-printed. Reach out on his contact form, he wrote back to me in an hour.